--- vanilla/usr/sbin/install_packages	2009-11-03 10:23:51.000000000 +0100
+++ patched/usr/sbin/install_packages	2009-11-05 17:09:32.000000000 +0100
@@ -69,7 +69,8 @@
 
 
 # @commands is the order of the commands that are executed
-our @commands = qw/y2i y2r yast rpmr urpmi urpme yumgroup yumi yumr smarti smartr hold taskrm taskinst clean-internal aptitude aptitude-r install unpack remove dselect-upgrade/;
+our @commands = qw/y2i y2r zypper yast rpmr urpmi urpme yumgroup yumi yumr smarti smartr hold taskrm taskinst clean-internal aptitude aptitude-r install unpack remove dselect-upgrade/;
+
 %command = (
           "install" => "apt-get $aptopt --fix-missing install",
     "inst-internal" => "apt-get $aptopt --fix-missing -s install",
@@ -90,6 +91,7 @@
 	     "yumi" => "yum -y install",
 	     "yumr" => "yum -y remove",
         "yumgroup"  => "yum -y groupinstall",
+	  "zypper"  => "zypper -n install",
 	     "y2i"  => "y2pmsh isc",
 	     "y2r"  => "y2pmsh remove",
 	     "yast" => "yast -i",
@@ -272,13 +274,20 @@
       # by default no classes are listed after this command so doit
       $doit = 1;
       if ($cllist) {
-	# no classes specified after PACKAGES command
+        # no classes specified after PACKAGES command
         # so add all packages listed
-	# use packages on for a list of classes
-	$doit = 0; # assume no class is defined
-	@oclasses = split(/\s+/,$cllist);
-	# if a listed class is defined, add the packaes, otherwise skip these packages
-	foreach (@oclasses) { exists $classisdef{$_} and $doit = 1;}
+        # use packages on for a list of classes
+        $doit = 0; # assume no class is defined
+        @oclasses = split(/\s+/,$cllist);
+        # if all listed class are defined, add the packaes, otherwise skip these packages
+        foreach (@oclasses) {
+          if (/^!/) {
+            s/^!//;
+            not exists $classisdef{$_} and $doit = 1 or $doit = 0 or last;
+          } else {
+            exists $classisdef{$_} and $doit = 1 or $doit = 0 or last;
+          }
+        }
       }
       next;
     }